①4.5×0.1=0.45; ②6.3÷0.7=9; ③12+1.2=13.2; ④2.5-1.6=0.9; ⑤200×0.04=8;
⑥1÷0.25=4; ⑦5.5÷11=0.5; ⑧3.6÷0.09=40; ⑨7.5×0.4=3; ⑩0.25×4×9=9.
①4.5×0.1=0.45; ②6.3÷0.7=9; ③12+1.2=13.2; ④2.5-1.6=0.9; ⑤200×0.04=8;
⑥1÷0.25=4; ⑦5.5÷11=0.5; ⑧3.6÷0.09=40; ⑨7.5×0.4=3; ⑩0.25×4×9=9.